英语词汇“ephemeris meridian”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	ephemeris meridian
释义	ephemeris meridian ephemeris meridian The fictitious terrestrial meridian that rotates independently of Earth at the uniform rate defined by terrestrial dynamical time. It is 1.002 738 δT east of the Greenwich meridian (see delta T). Ephemeris longitude and ephemeris hour angle are measured relative to the ephemeris meridian.
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